High-tenacity circular fabric made of normal yarn rather than high tenacity yarn

ABSTRACT

Disclosed is a high-tenacity circular fabric made of normal yarn rather than high-tenacity yarn. The high-tenacity circular fabric has a weight in a range of 150 g/sqm to 400 g/sqm and is woven with yarn having strength in a range of 3 g/den to 6 g/den, wherein the yarn is woven into the high-tenacity circular fabric by a circular knitting machine, and a cam of the circular knitting machine is formed with grooves which are sequentially formed according to arrangement of a running position, a clearing position, a modified running position, a tuck position and a knock-over position.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a high-tenacity circular fabric made of normal yarn rather than high-tenacity yarn, and more particular, to a high-tenacity circular fabric made of normal yarn rather than high-tenacity yarn, which has high density and high tenacity properties implemented through improvement in a circular knitting structure.

2. Description of the Related Art

A base fabric for artificial leather used for furniture, a vehicle and the like is classified into an inexpensive product for maintaining a form of artificial leather and an expensive product to which the physical properties of natural leather are required.

To meet the physical properties of natural leather, there are a method of fabricating a fabric using not normal yarn but high-tenacity yarn and a method of thickly fabricating a fabric using normal yarn.

However, in case of using high-tenacity yarn, although a fabric is fabricated through a circular knitting process, the cost is increased due to using of expensive yarn. In case of a method of thickly fabricating a fabric by using normal yarn, needle punching and polyurethane impregnation of a non-woven fabric process are combined so that the process is complex.

SUMMARY OF THE INVENTION

The present invention provides a high-tenacity circular fabric made of normal yarn rather than high-tenacity yarn, wherein the high-tenacity circular fabric has a weight in a range of 150 g/sqm to 400 g/sqm and woven with yarn having strength in a range of 3 g/den to 6 g/den, wherein the yarn is woven into the high-tenacity circular fabric by a circular knitting machine, and wherein a cam of the circular knitting machine is formed with grooves which are sequentially formed according to arrangement of a running position, a clearing position, a modified running position, a tuck position and a knock-over position.

In addition, a needle may be connected to the groove and may move along positions of the groove to perform a weaving work, and, when the needle moves to the running position, the clearing position, the modified running position, the tuck position and the knock-over position, first feeding yarn may be formed in rear of second feeding yarn to form a first loop and previous yarn may be formed in front of the second yarn to form a second loop.

The yarn may have radial tensile strength in a range of 30 kgf/30 mm to 90 kgf/30 mm, lateral tensile strength in a range of 25 kgf/30 mm to 75 kgf/30 mm, radial internal tearing strength in a range of 3.5 kgf to 10.5 kgf and lateral internal tearing strength in a range of 3.0 kgf to 9.0 kgf.

According to the present invention, there is provided a high-tenacity circular fabric made of normal yarn rather than high-tenacity yarn, which may have high density and high tenacity properties implemented through the improvement in a circular knitting structure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view illustrating the position of a needle when a fabric is woven by using a general type of a circular knitting machine.

FIG. 2 is a schematic view illustrating the position of a needle when a fabric is woven by using a circular knitting machine used for the present invention.

FIG. 3 is a table illustrating Embodiments 1 and 2 of normal yarn woven in the circular knitting structure of the present invention shown in FIG. 2, Comparative example 1 of normal yarn and Comparative example 2 of high tenacity yarn which are woven in a conventional circular knitting structure, and Comparative example 3 utilizing a non-woven fabric process.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings is illustrated only for the purpose of more easily explaining the subject matter of the present invention. It should be easily understood by those of ordinary skill in the art that the scope of the present invention is not limited to the accompanying drawings.

Furthermore, in the embodiments of the present invention, the same terms and reference numerals will be used throughout the drawings to refer to the same or like parts and any additive details thereon will be omitted.

The terminologies used in this specification are used to explain the particular embodiment only and it is a not an intention to limit present invention. The expression for singular shall include the plural meaning unless otherwise interpreted clearly in the context. The terminologies of “include” or “have” in this specification is to define the existence of the characteristics, figures, stage, motion, constituent element, part or its combination, and it shall be understood not as excluding the existence and the additional possibilities of one or more other characteristics, figure, stage, motion, constituent element, part or its combination.

FIG. 1 is a schematic view illustrating the position of a needle when a fabric is woven by using a general type of a circular knitting machine.

A needle, which moves while being coupled into a groove of a cam when a fabric is woven by using a general type of a circular knitting machine as shown in FIG. 1, will be described as follows.

As shown in FIG. 1, the cam is formed with the groove sequentially connected to the needle according to positions corresponding to a first running position 10, a tuck position 20, a second running position 30, a clearing position 40 and a knock-over position 50.

The needle 70 moves according to the position of the groove while being connected into the groove such that a weaving work is performed.

The needle 70 includes a head 72 and a body 78, where the head 72 includes a ring 73 and a latch 74 for opening or closing the ring 73.

The latch 74 includes a rear end 75 hinge-coupled to the body 78 and a front end 76 rotatable about the rear end 75.

Since the hinge coupling configuration of the rear end 75 is well known to those ordinary skilled in the art, the details will be omitted.

First, previous yarn is latched to the head 72 of the needle 70 placed at the first running position 10, and while moving from the first running position 10 to the tuck position 20 along the groove, the needle 70 allows the previous yarn 81 to move the front end 76 of the latch 74 downwardly so that the previous yarn 81 is placed at the front end 76.

The previous yarn 81 refers to a yarn latched to the ring 73 of the needle 70 before the needle 70 moves to the first running position 10.

Meanwhile, first feeding yarn 82 is located at the tuck position 20, so that the first fed yarn 82 is latched to the ring 73.

In addition, as the needle 70 moves from the tuck position 20 to the second running position 30, the previous yarn 81 and the first feeding yarn 82 are latched to the ring 73 at the same time.

When the needle 70 moves from the second running position 30 to the clearing position 40, the previous yarn 81 and the first feeding yarn 82 all move downwardly of the latch 74 to be latched to the body 78 and a second feeding yarn 83 is latched to the ring 73 placed at the clearing position 40.

The clearing of the clearing position 40 represents the stat that the latch 74 moves downwardly from the ring 73 so that the latch 74 is opened.

When the needle 70 moves from the clearing position 40 to the knock-over position 50, second feed yarn 83 forms a loop while allowing the previous yarn 81 and the first feeding yarn 82 to move inwardly.

In this case, a first loop 91 formed between the previous yarn 81 and the second feeding yarn 83 has the same size as that of a second loop 92 formed between the first feeding yarn 82 and the second feeding yarn 83.

As described above, the circular knitting machine of FIG. 1 allows the previous yarn 81 and the first feeding yarn 82 to form the loops in front of the second feeding yarn 83.

Meanwhile, a circular knitting machine using a modified running position, which is capable of producing more various types of fabrics by changing a position of the groove formed on the cam of the circular knitting machine used for the present invention, is provided.

FIG. 2 is a schematic view illustrating the position of a needle when a fabric is woven by using a circular knitting machine used for the present invention.

As shown in FIG. 2, a cam is sequentially formed with a groove according to arrangement of a running position 110, a clearing position 210, a modified running position 370, a tuck position 410, and a knock-over position 510.

A needle 700 moves according to the position of the groove while being connected into the groove, such that a weaving work is performed.

The needle 700 includes a body 780, a ring 730 and a latch 740.

When the needle 700 moving along the groove is located at the running position 110, previous yarn 810 is latched to the ring 730.

When the needle 700 moves from the running position 110 to the clearing position 210, the previous yarn 810 is latched to a circumference of the body 780 while the latch 740 is downwardly rotated, first feeding yarn 820 is latched to the ring 730.

When the needle 700 moves from the clearing position 210 to the modified running position 370, the previous yarn 81 surrounds an outer circumference of the latch 740 while the latch 740 moves upwardly and it is maintained that the first feeding yarn 820 is latched to the ring 730.

When the needle 700 moves from the modified running position 370 to the tuck position 410, the first feeding yarn 820 is latched to the circumference of the latch 740 while allowing the latch 740 to be downwardly rotated, and second feeding yarn 830 is latched to the ring 730.

In this case, since the previous yarn 810 is latched to a low body 780 of the latch 740 and the first feeding yarn 820 is latched to the circumference of the latch 740 downwardly rotated, the previous yarn 810 is located below the latch 740 and the first feeding yarn 820 is located over the latch 740.

When the needle 700 moves from the tuck position 410 to the knock-over position 510, the latch 740 moves upwardly by the previous yarn 810 while the needle 700 moves downwardly, so that the first feeding yarn 820 is formed in rear of the second feeding yarn 830 to form a first loop 930 and the previous yarn 810 is formed in front of the second feeding yarn 830 to form a second loop 940.

Thus, according to the embodiment of the present invention, a circular fabric woven by using normal yarn rather than high-tenacity yarn may be provided. In addition, according to the present invention, a high-density and high-tenacity property can be implemented by simultaneously forming loops in rear and front of a previous loop. Further, the present invention may meet the physical property required in the industrial field even by using normal yarn rather than high tenacity yarn.

Meanwhile, a physical property of natural leather classified as an expensive product must meet the condition that a fabric in the range of 150 g/sqm to 400 g/sqm has radial tensile strength of 30 kgf/30 mm or more, lateral tensile strength of 25 kgf/30 mm or more, radial internal tearing strength of 3.5 kgf or more and lateral internal tearing strength of 3.0 kgf. Hereinafter, the physical property to be met by natural leather classified as an expensive product will be called a “condition of natural leather”.

A method of measuring the physical property is ‘MS321-07’ and the tensile strength is measured with a sample formed in a strip of 30 mm. The internal tearing strength may be measured through the general measuring method and denoted in a general unit.

In addition, the measuring method of ‘MS321-07’ is performed in a cut-strip scheme, where the details about the cut-strip scheme are disclosed in page 146 of the book entitled “Fabric Measurement and Analysis” 1990 by “Munundang”.

FIG. 3 is a table illustrating Embodiments 1 and 2 of normal yarn woven in the circular knitting structure of the present invention shown in FIG. 2, Comparative example 1 of normal yarn and Comparative example 2 of high tenacity yarn which are woven in a conventional circular knitting structure, and Comparative example 3 utilizing a non-woven fabric process.

The normal yarn of Embodiment 1, which is yarn having strength in the range of 3 g/den to 6 g/den, is woven in a circular knitting structure of FIG. 2, where the weight of the fabric is 200 g/sqm, the radial tensile strength is 35 kgf/30 mm, the lateral tensile strength is 28 kgf/30 mm, the radial internal tearing strength is 4.0 kgf, and the lateral internal tearing strength is 3.8 kgf.

As the result, Embodiment 1 meets the condition of natural leather.

The normal yarn of Embodiment 2, which is yarn having strength in the range of 3 g/den to 6 g/den, is woven in a circular knitting structure of FIG. 2, where the weight of the fabric is 300 g/sqm, the radial tensile strength is 43 kgf/30 mm, the lateral tensile strength is 32 kgf/30 mm, the radial internal tearing strength is 4.8 kgf, and the lateral internal tearing strength is 4.6 kgf.

As the result, Embodiment 2 meets the condition of natural leather.

The normal yarn of Comparative example 1, which is yarn having strength in the range of 3 g/den to 6 g/den, is woven in a circular knitting structure of FIG. 1, where the weight of the fabric is 300 g/sqm, the radial tensile strength is 20 kgf/30 mm, the lateral tensile strength is 15 kgf/30 mm, the radial internal tearing strength is 2.5 kgf, and the lateral internal tearing strength is 1.8 kgf.

As the result, since Comparative example 1 has the radial tensile strength of 20 kgf/30 mm, Comparative example 1 does not met the condition of natural leather of radial tensile strength 30 kgf/30 mm. In addition, Comparative example 1 does not met the remaining conditions of natural leather.

The normal yarn of Comparative example 2, which is yarn having strength in the range of 7 g/den to 10 g/den, is woven in the circular knitting structure of FIG. 1, where the weight of the fabric is 300 g/sqm, the radial tensile strength is 45 kgf/30 mm, the lateral tensile strength is 33 kgf/30 mm, the radial internal tearing strength is 4.5 kgf, and the lateral internal tearing strength is 4.3 kgf.

As the result, although Comparative example 2 meets the condition of natural leather, expensive high tenacity yarn is used.

The normal yarn of Comparative example 3, which is yarn having strength in the range of 3 g/den to 6 g/den, is woven by utilizing in the non-woven fabric process, where the weight of the fabric is 600 g/sqm, the radial tensile strength is 40 kgf/30 mm, the lateral tensile strength is 30 kgf/30 mm, the radial internal tearing strength is 4.6 kgf, and the lateral internal tearing strength is 4.5 kgf.

As the result, although Comparative example 3 meets the condition of natural leather, the weight of the fabric is heavy and the process is complex.

As described above, Embodiments 1 and 2 of the present invention use the circular knitting structure of FIG. 2 so that the effect of natural leather is generated.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. 

What is claimed is:
 1. A high-tenacity circular fabric made of normal yarn rather than high-tenacity yarn, wherein the high-tenacity circular fabric has a weight in a range of 150 g/sqm to 400 g/sqm and woven with yarn having strength in a range of 3 g/den to 6 g/den, wherein the yarn is woven into the high-tenacity circular fabric by a circular knitting machine, and wherein a cam of the circular knitting machine is formed with grooves which are sequentially formed according to arrangement of a running position, a clearing position, a modified running position, a tuck position and a knock-over position.
 2. The high-tenacity circular fabric of claim 1, wherein a needle is connected to the groove and moves along positions of the grooves to perform a weaving work, and wherein, when the needle moves to the running position, the clearing position, the modified running position, the tuck position and the knock-over position, first feeding yarn is formed in rear of second feeding yarn to form a first loop and previous yarn is formed in front of the second yarn to form a second loop.
 3. The high-tenacity circular fabric of claim 1, wherein the yarn has radial tensile strength in a range of 30 kgf/30 mm to 90 kgf/30 mm, lateral tensile strength in a range of 25 kgf/30 mm to 75 kgf/30 mm, radial internal tearing strength in a range of 3.5 kgf to 10.5 kgf and lateral internal tearing strength in a range of 3.0 kgf to 9.0 kgf.
 4. The high-tenacity circular fabric of claim 2, wherein the yarn has radial tensile strength in a range of 30 kgf/30 mm to 90 kgf/30 mm, lateral tensile strength in a range of 25 kgf/30 mm to 75 kgf/30 mm, radial internal tearing strength in a range of 3.5 kgf to 10.5 kgf and lateral internal tearing strength in a range of 3.0 kgf to 9.0 kgf. 